It's not like FCP7 just got deleted from their computers.
No.. but support has. And without the ability to import older projects - editors now have to use two different programs (one for new projects and one to edit/revise older ones)
The fact is - for many professional editors - FCPX isn't usable as released. And those editors are completely justified in voicing their complaints. Why? Because Apple released the software and is selling it. That entitles anyone (professional or not) to evaluate it and voice their issues/compliments.
The logic of "just don't upgrade" is a bit faulty. The point isn't if/when it will be viable to upgrade. The issue TODAY is that it's not usable and that's what some people are commenting on.
Arn's comment a few pages back is very eloquent and accurate.
I also can't think of any new software version that wasn't able to import an older version. I *think* I understand why it wasn't/isn't possible with FCPX - but I also think something could have been done - even with user prompting - to facilitate an import of some sort.
And for the person who joked/mocked/whatever about MS Office having issues importing older files - I have to laugh because I've been using MS Office since the first version - and except on a very few occasions - I've never NOT been able to import an older file into the new version. Does it need some tweaking - sometimes. But it still imports.